A reclusive Memphis neighborhood is home to decades worth of misunderstood Masonic folk art.

A treasure trove of rare and fine fabrics from around the world.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

The "Greatest Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

Step into the cool deep past and unknown future of who begat who.

Be careful not to get trampled at this lively two thousand-year-old market.

The closest thing to Mars on Earth.

A mysterious monument meant to be a guide into "an Age of Reason" was destroyed after an apparent bombing.

Hidden behind Lincoln's head is a 70-foot-long chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.

Cold storage for agricultural biodiversity.

The world's first time capsule lies behind a welded steel door in Atlanta.

One of the world’s most colorful cemeteries, where each pigment is symbolic.

A hobby born from insomnia has turned into a hangar full of objects that have been be-buttoned by the Button King.

An oddities shop that dabbles in the deathly and beautiful.

Recycled junk and fishing buoys litter the yard and facade of this bait shop cum art project.

In Florida, these naughty monkeys live on their own mini-monkey Alcatraz.

The scuba diving training facility was named for the steam that rises from the cave's chimney.

An abandoned village that doubled as "The Hunger Games"' post-apocalyptic wasteland is up for grabs.

Just a few miles from downtown Atlanta is a trail covered in a crazy collection of outsider art.

A man's home is his castle.

Bubbling up from deep underground is the warm crystal clear water that fills the Warm Springs Pools, America's oldest spa.

Take a steam-powered ride straight out of the past on this Appalachian rail line.

The ruins of a cotton mill that was burned in the Civil War are still hidden in a Georgia forest.

One thousand trees were planted in Norway to be used to print books a century from now.